Molding apparatus



l`July 7, 1925. l

J.*S. HARRISON MOLDING APPARATUS Filed May 24, 1924 3 She'ets-Sfxeet `1July 7, 1925.

Y l J. S. HARRISON MOLDING APPARATUS Filed May 24, `1924 3 S-hets-Sheet'2 July 7,1925.` 1,545,255 J. s. HARRISON v MOLDING APPARATUS vF1155Mayall, 1924 5 sheets-sheet 5 .llmlll CII lil

Patented July 7, 1925.

UNITED STATES JOHN STANLEY HARRISON, or LONDON, ENGLAND, AssIGfNoa'v ToliirAcIvAi?.,s'TRATI FIND coAL LIMITED, or LONDON, ENGLAND, A BRITISHc'oMPANY.

, l I y MOLDING APPARATUS.

Application led May 24, 1924. Seria1-No.-715,617.

To all 'whom t may concern.'

Be it- 1irnovvn that I, JOHN' STANLEY HAR- nrsoN, a subject of the Kingof England, residing in London, England, have invented certain new anduseful Improvements in Molding Apparatus, of which the vfollowing is aspecification.

This invention is for improvements in -or relating to moldingfapparatusvfor consolidating powdered or plastic material 4into block form, vforexample in the manufacture of fuel briquettes. The invention deals Witha machine of the 'type in Which the consolidation of the material iseffected Wholly or partly by a pressure-plunger (e. g. a dead- Weightplunger) operating on the top of the material in the mold and in Whichmeans are provided for side-stepping the mold into and out of registerwith the pressureplunger Aand for ejecting the compressed block When'the mold isV in the side-stepped position. y 1

V According to the present invention the mold is trough-shaped and Whenunder fthe, Vplunger' has itsopen ends 4closed byfiXed.

Walls Which are so shaped andpositioned .as tol register' with said openends when the mold is in the presssure position but to be clear ofsaidfends when vthe mold isfsidestepped. The ejection of the compressedblock is effected by an ejector' movable 1n a direction transverse tothe sideways movement of the mold into and out of the space occupied bythe throughway of the 4troughshaped part when the latter Ais in theside-1 as the companion mold -iS side-stepped there# from, and operatingin conjunction With the' molds are two ejectors movable as a single unitinfa'direction transverse to the'path 'of the molds into andout of thespaces Which Will in turn be .occupiedby the throughvvay of theside-stepped mold.

According to a feature of Vv the invention' a measuring-box 1soperatlvely connected kto the ejector-unit for movement thereby rbe.l

tween a position in which it is arranged to receive anie'asured chargematerial and en@ ie' :relaiiS ,arranged to. delire. Said '011 a table1.4: which iS Charge ,to ai@ mold which is. undelete plunger. r 1According to a further feature ofthe in vention the sideways movement ofthe molds andthe advanceand Withdrawal of the ejector-.unit areperiodically effected bymeans (e. g; cam-actuated means) operated instepf from a single continuously-running driving member.

#A molding' machine embodying thev fore-,"2

going and other features of the invention Will now be described by'Wayvof example f with reference to the accompanyingf'draw.- ings, inWhichy A Figure l is a front view of the machine with the right-hand.unit shown asfa centraly i" vertical section through the mold-table;v

F1gure2 -is ka plan view showing the `mechanical gear for operating thevarious moving parts of the machine; I

Figure 3 is an end elevation Y(-pz'irtly'in section) shovvingone of themeasuring-boxes and the method by Which thema-teria-l is fed into themolds, and

Figure 4 is a viewon a larger scaleillu'sV tratin-g thedevice employedfor transmitting a reciprocatory movement to the molds.

Like reference-numerals' indicate likefparts in the different figures.The variousparts of the machiney such as "shaft bearings and the likehave been-omitted from thedrawings forthe salie of clearness. f

The apparatus illustrated is vattivo-unit machine designedV Vfor the-manufa'cturefof fuel briquettes."v There; areftwo pressureplungers '5,6,- appropriate respectively' toV the left and right hand units of themachine; The plungers l arev adapted to' be raised by solrack-and-pinion Velevator mechanism ,vvhere-` of the racks are formed onvertical bars 7 extendingv upwardlyr from dead-Weights 8v to whichtheplungersfare,` resiliently cone nected by sprin`g-pressed bolts'9.IMeans,

which dovnot form part ofthe present vin`` vention,`are provided vtocontrol the Yopera'- tion'of the elevator mechanism so that thepressure-plungers are periodically `raised, maintained in theraisedposition for a' determined time and then released.'vl Thereare'fou'r r'noldslfl,l l1, 12,13 (num'v bered consecutively-:from lefttov right-'in Figure 2) -arranged line and sup 'prted x irited onrlers`15 torto-endif@ erlaen a beaamt and adapted, by means hereinafter de-Vscribed, to receive a rapidV reciprocat'oiy movement of comparativelyvshort throw, whileV the mold is Linder the 1:)lnnger-V rFlicconsolidation oi the material in the molds is' efiected partly by theapplication top pressure thereto by the plungers 5, and partly by thetamping' or jigging action oi" f the pallets 17.

' lNhen a mold is in position under the corresponding plunger its openends (i. -eithe openends of the trough) are closed by fixed nioldpl-ates18 which register with said ends butv are clear oi' the ends oi the'companion mold which is in the side-,stepped position.; In theYdrawings the mold ta le le is shown at Vthe right-hand limit oi' itstravel and as will be seen the leit-hand mold cli veach pair is' underthe corresponding pressure-plunger and in register with the fined endplates 18 while Vthe right-hand mo-ld is side-stepped therefrom. Vhenthe mold-table is moved tothe lett-hand limit of its travel in. order tobrin-g thefprevi-ously side-stepped mold-s (i. e. ll, 13) under thepressure-plungers, the molds 10,12 containing the compressed blocks areside-stepped to the lelft oil their respective pressure-plungers. Itwill be seen therefore' that `as themold-tableis alten nately moved totheV lett and then to the right the side-Steppcdincld. oi each pair ac-vvcupi-es alternately pfositionson opposite' .sides of,the correspondingplunger.. The' two units oi' the machine are so disposed in relation toeach other thatl thefposition occapiedi by the side-stepped. mi-)ld ofthe leithand' pair when the mold-table is moved. to the right. is'`coincident withthe posi-.tien occopied.A by the sidejstoppedV mold theright-hrend. when the mold-table is movedl to) the lleit.- There thusonly three separate; side-stepped' positions, the

central onef of which .common to. 'both unitsl Located: at the back, ofthe molds and opposite thethree side-stepped positions aforesaid arethree block-ejfectors 19 which are supported en a cajrrier 2OI guided.tor

moverloentV in a. c ldnrectiony transverse to the path. :of theYmold-table. The three ejectors are movable as a single r1in-it into' andont etv the"A three side-stepped positions aforesaid, tliatfisi intoandV out et three spacesof which two will always be occupied bythethronghways of the side-stepped molds. llachl ejector is formed with airont plate 2l having its lower edge conforming to the -,rolile `ofthebottom pallet of the mold. At

the iront of. the molds and' opposite the three side-stepped positionsthereof are three roller frames 22 adapted to receive the iin-V Theejector-carrier is operatively Aconnected by rods 23 to one arm. oi' abellcrank lever 2&1; which is pivotally mounted at its ulcrum 25' to alined part of the machine frame; The other arm o1 this lever carries a'roller 26 which-in turn-.engages with and constitutes a follower iorscroll cam. 27 formed on the periphery a r( able drum 28. During theoperation machine the drum' 28 is constantly rotated by means' oi'toothed gearing 29, '30', from a main shaft 3l which constitutes theconti-ii '1- ously-ru'nning driving member lie-reinbejore referredto.rEhe cam profile is such. that daring' the continued rotation oli thevdrmi'i 28 the'y ejie'ctor-uini't. is periodically advanced so as to movethe ejectors into the troughs et the side-stepped molds, to maintainthem in 4this positioifrtor a certain interval and then f tor withdrawthe ejector-unit. rEheadvance andv withdrawal oi the ejector-imitvissynchronized with the-,sidewaysmovement of the molds so that thee'jfectors int., op eration immediately the: meldet bile comes to restat one or other limit ci its travel.

Moldtab le.

VThe reciprocating mechanism torl the mold-table (sce Figures 2 andl 4C)comp-rises a yoke member 32 guided orv-reciprocatio-n in a straight linepath by aV U-shapedbed plate SQ-fon which the base of the yoke` slidesand by a bearing standard 34 engaging a rod 35 which extends from theyoke member in the direction of its length. The yoke is termed withvtwoopposed cam ta'ces 36, 37

separated by agjapv and extending in a direction ohliqiicly across thepath to whichthe yoke'is constrained by itsv guides. (lo-open atingtwiththe yoke member 32Ais acrank pin '38 extending laterally from arotatable 39 `and adapted to impart a reciprocatory movement to theyokeby engagement iirstlrwith one of the opposed tacosVv 36, 37

and then with the other.y The two cam tacos f so spaced apart in a'direction parallelto the path ofi the yoke as to provide for d dwell'between'` the disengagement of the crank pin trom one falceanditsengagement with the opposite face. It will Abe seen that l the yoke32 virtually constitutes a slotted link with lost motion between thecrank. pin and the sides of the slot. The reciprocatory vmotion of theyoke is transmitted to the vsecured to the underside of the mold-table.

The crank disc 39is continuously driven lby meshing gear wheels v47 froma shaft` 48von which the drum 28 is mounted. The movement of the yokevin each direction is limitedv by fixed stops 45 which are secured to theupright wings ofthe U-shaped bearing 3 3 and pass through slots 46 atthe lower end of the yoke. Thestops 45 prevent over- Vrunning of-theyoke and ensure accurate registration of the molds with thepressureplungers and the ejectors. l l.

M old-pallets.

Each bottom pallet 17 is formed with two pairs of downwardly projectingstuds 50, which, in the pressure position of vthe mold, register withthe upper ends of two corresponding pairs of tappets 51 arranged `inco-operation vwtih lcams 52 rotatable by a shaft 53 extendinglongitudinally at the lower end of the machine. The 'tappets 51 areconstrained to followthe cams by means of springs 54 which Vpress thetappets down wardly and maintain bridge pieces 62, which interconnectthe front and back tappets of each pair, in contact with the uppersurfaces of the operating cams. The cams 52 are formed on or secured toa sleeve 55 which is keyed to the shaftf53 so as to-be rotatabletherewith but axially slidable thereon. VEach cam is formed with a.tapering portion as shown ,which terminates ina plain cylindrical part56. The two cam sleeves 55 are coupled together for axial'v movementas asingle unit bymeans of half-bearings 57 connected by a rod 58.l` Thepositionof the rod 58, and thus the position of the cams in relation tothe tappets, vis controlled by a bell-crank lever 59 one arm of whichengages the connecting rod 58, and the other is connected to a link 60carrying at its free end a cam follower 61 which engages a facelcam onthe drum 28. The cam shaft 53 is driven from the main shaft 31vhereinbefore referred to or from another vcontinuouslyrunning shaft(not shown) from which the' drive also passesvto the main shaft 31. Whenthe tappets v51 are in the position shown in Figure 1, that is whentheir lower .ends are in contact with the pla-in cylindricalfportions 56of the cam-sleeves, rotation of the cam shaft does not impartanylvertical movement to. .the terp-@ts and the bettom Pellets of themoldsl thus remain` stationary. The face-cam onthe drum 28 is soarranged. as regards its phase. of operation in relation yto that .ofthe reciprocating mechanism for the mold-table that the operating ycamsVfor ure 1 position immediately prior to the sidestepping ofthemold-table and are heldin this position during the side-steppingmovement. l/Vhen the mold-table is again at rest 7 u vthe bottompalletsare brought into the F ig f the face-cam on the drum 28 operatesto slide the cam sleeves to theright in Figure l, anda rapidreciprocatory movement is then imparted tothe bottom vpallets of themolds. yAs the cam'lobes are gradually increased in size from righttoleft, `on movement of the cam-sleeves in this.' direction the throwimparte-d to the tappets is. gradually increased lfrom zero to a maximumand onV movement of the sleeves from left to right `the reversevariation takes place.v

' Feeding Cmd measuring apparatus.

nected tothe ejector-unit for movement therewith 'by means of rigidupright bars 72,, the ,upper ends of which are pivotally connected tothe sides of the box by links 7 3. The box .is supported and vguided inits to-and-fro movement by Vrollers .74. which,

run on rfixed ledges 75. When the open upperend of the box is is inregister with the discharge mouth of the hopper the lower end of` thebox is closed by aiixed plate 7 When the box is in this position itreceives its charge of material from the hopper. At the upper end of thebox is a rearwardly extending ledge V77 adapted on ythe forwardmovementv ofthe measure to cutoff com-r municationbetween the hopper.and the in.-

terior of the box. lVhen the` latteris fully advancedthe dischargemoutlrof .the hop` per is completely closed by the ledge 77,

andas the box is advanced its lower end is uncovered by the yplate 76and the contents of the box fall on to an 4inclined vibraT tory chute78whichV delivers they material into a fixed box-shaped part 79surmounting and,constituting an upward extension of the movable rmoldwhen the latter is iny the pressure position. When the ejector!" unit isnext withdrawn the measuring-box is' moved back into the positionshown-in Figure ,3 ready to receive a freshA charge.y

It lwill be understood that lthere is a.Y separate measuring-box,supply-hopper and de- .ighgd beck a). employ ,a plurality of parallel lrlivery chute with their associatedparts for` i I vertical blades,located in the mold during the initial stageof the consolidatifm of thematerial therein A d-evice of'this 1sind iii-ay" if desir-ed be used inconjunction with the present machine vandin thek example illustratedsucha devicev is provided. Theiblades S0 are mounted on theejector-carrier 'Q0 opposite the positions occupied by the molds whenunder their respective plungers, and in register with slots 8l in thefixed end walls 16 atthe back of the molds. rlfhe two sets of blades 8Oarel thus located in the same relative positions along' the carrier 2t)as the measuring botes 7l. The blades are movable-with the 'ejectors andon the ad"- vance of the' latter (and therefore also of the measuring`box-es) they enter the molds through thes'lots 8l Y and remain in thisposition until the ejector-unit is withdrawn.

rlhe generalsequence of operations ofthe machine asa whole' is as'follows The measuring boxes ,71, filled with the material to beconsolidated (e. g. coal-dust mixed with a binding medium such as'hitumen), the laminating or stratifying blades 8O andthe ejectorsl)moved forward simultaneously by the advance of the carriage 20. rlhusas'the blades 8O enter the molds under theplungers and the measuredcharges are delivered tosaid molds, the ejectors enter the side-steppedmolds and eject the finished blocksV therefrom. The connecting rod 5S isnow thrown over by the facecam on the drum 28 and the tappet-ac'tuatingcams 52come into operation to oseillate the bottom pallets 17 of themolds under the plungers. Theejector-unit and with it thestratify-ingvblades and the measuring boxes is now 'withdrawiu thepressurepluneers 5, 6 arereleased and allowedto fall on to the top ofthe material inthe molds and this conditionis maintained for apredetermined time sufiicient for'the reol'uired consolidation of theblocks Oscillation of the bottom pallets is then stopped,l

the pressure-plungers are raised .and the Y cam yoke 3 2 side-steps themold-table. rlhesame sequence of operations is then repeated.l lt willbe understood that the machine operates continuously, the` variousoperations described above being` effected au#V tomatica'lly by thecontinuous rotation of the main driving' shaftQy lt willbeappreciatedfthat the apparatus hereindescribed is only given by way ofexample and may be modified in many without departing from the scopeY ofthe inventionn l claim:V j l. In molding apparatus of the type specifiedthe combination with a pressureplunger of a trough-shaped mold, means tomove said mold sideways clearof the pressure-plunger, fixed walls soshaped and positioned as to close the open ends of the Vmold when thelatter is underthe plungerV but toA be clear of said ends when the moldis side-stopped, and an ejector movable in a direction transverse tothey sideways movement of the mold into and out of the space occupied bythe througliway of the troughshaped part when said part is in the side'-stepped position;

2. ln molding' apparatus of the type specified the combination Awith apressureplunger of two trough-shaped molds, means to move said moldssideways as av unit to bring each mold in turn under the pressureplungerthe` companion mold is sidestepped therefrom, fixed walls so lshaped andpositioned as to close the open ends of the mold which is under theplunger but to be clear of the ends of the companion' mold,

two ejectors and means to movel said ej'ectors Y asl single unit in adirection transverse to' the path of themolds into and outY ofthe spaceswhich will in turn be occupied bythe throughway of the 'side-stepped'mold.

3. In molding apparatus of the type specified the combination withapressure- 'plunger of two trough-shaped molds, means to'move said moldssideways as a unit to bring each mold in turn under the pressureplungeras the companionV mold is vside'- stepped therefrom, fixed walls soshaped and positioned `as to4 close the open'ends' of the mold which'isunder the plunger but to be clear of the ends of. the companionm'old,two ejectors, means to move said eje'ctor's as a single unit in adirection'transverse to the path ofthe molds into and outv ofth'evspa'ces which will in Yturn be occupied by the throughway of thesidestepped mold, j and a measuring-box operatively connecte'dfto'theejector-unit for movement thereby between a position in whichitis'ai'franged' to l 'Uil receive a measured Charge' of material andr Yone in which it is arranged to deliver said charge to the mold under theplunger. Y

' 4. ln molding'.` apparatus of the type lli) specified the combination4with a-pressureplunger of two Vtrough-shaped molds,- movable sidewaysas' a unit to bring eachY mold in tui'nvunder the pressure-plunger asthe. companion moldis side-stepped therefrom, lixed'walls so shapedand'positioned as to close thev open ends. of the mold which is. underthe plunger but to be clear ofthe ends ofthe companion mold, twoejectors movable as a single unit in a direction transverse to the pathofthe molds into and' out of the spaces which will in turn be occupiedby the throughway of the side-steppedmold, a Vcontinuously-running,driving member, and means operated thereby periodically *to* effect thesideways movement vofthe molds and the advance and withdrawal of the ejecl llh lio

plunger of two trough-shaped molds, movverse to the path of the moldsinto and out of the spaces which willl in turn be occupied by thethroughway of the side-stepped mold, a continuously-running drivingmember, meanscam-actuated from saidmember for effecting the periodic.advance and Withp drawal of the ejector-unit, and a rack-andpinionreciprocating mechanism for the molds operated Afrom thecontinuously-run-v plunger of two trough-shaped mol s, meansto move saidmolds sideways as a unitto bring each mold in Vturn under the pressure-lplunger as the companion mold is sidestepped therefrom, fixed walls soshaped and positioned as to close the open ends of the mold which isunder the plunger but to'be clear of the ends of the companion mold, twoejectors, means to move said ejectors as a single unit in a directiontransverse to the path of the molds into and out of the spaces whichwill in turn be occupied by the throughway of the side-stepped mold, andagplurality of parallel vertical blades carried by the ejector-unit formovement therewith and so positioned thereon as to register with slotsinV the adjacent fixed end-wall of lthe mold and to enter the moldthrough said slots on the advance of the ejector-unit. l

7. In molding apparatus of the ytype specified the combination withl apressureplunger of two trough-shaped molds, movable sideways as a unitto bring each mold in turnunder the pressureplunger as the companionmold is side-stepped therefrom,rflxed walls so shaped and positioned'asto close the open ends of the moldwhich is under the plunger but to beclear of the ends of the companion mold, two ejectors movable as asingle unit in a direction transverse as to register with slots in theadjacent' fixedrk end-wall ofthe vmolde-nd Ato enter:V

the mold through said slots on the advance of the ejector-unit andVmeanscam-operated from a continuously-runn'ingy driving memberperiodically to 'effect vlthe sideways movement ofthe moldsand theadvance and wlthdrawal yof the ejector-'unit .with the measuring-boxand'-blades ycarried thereby.

8. In lmolding apparatus of the :type specified-the combination with apressureplungervof two trough-shaped molds, mov-` able sideways asazunitv to'bringeach mold in turn under the pressure-plunger vas thecompanion mold is side-stepped therefrom, fixed walls so shaped'andpositioned as to close the 'open ends of the mold which is under theplunger but-to be clear` of the ends of the-companion mold, twoejector's movable-as a single unit in a direction transverse to the pathof the kmold into and ,out of the spaces which will in turnbe occupiedby the throughway of the side-stepped mold, y

a continuously-running 4driving l"member, means operated by said memberperiodically to 'effect' the advance and withdrawal ofthe ejector-unit,.a crank driven from the continuously-,running-mernber and engaging 'aslottedI link guided for reciprocation in a direction at right-angles tothe axis of rotation ofthe crank-and having its slot of such width as'to provide a dwell of the link before each reversalV of its movement,

movable as a single unit inv a direction l transverse tothe path of themolds into and out of the spaces which' will in turn be occupied by thethroughway of the side stepped mold, a continuously-running drivingmember, means operated bv said member periodically to effect the advanceand withdrawal of the ejector-unit, a yoke-member los. i

guided for reciprocationin a straight-line n path and having'two opposedfaces sepasr rated by a gap and extending transversely to the path ofthe yoke, a crank rotatable by the continuously-running member aforesaidabout an axis at right-angles vto the path of the yoke, said crankbeingv arranged toimpart a reciprocatorv movement to the yoke byengagement lirst 'with one of the opposed faces thereof and then withthey other and to provide a dwell of the yoke between the disengagementof one face and the engagement with the other,- and means 1.s4aa55 totransmit-thereeiprocatorv movement: of in `number to-zthev'side#stepped` positionsol the ivoire-member to the vmolds.` 'f l0.lInpinoldingA apparatus 'of Ythe: type speeified'tlie combination Witha` pressure-v plunger'of a troirglr-shapedni'old -havingga Bottoni-'partwhich. is slidableivertically Withinv `theV mold, :nieansto move saidmold iside- -Ways elear fof the pressure-plunger,fixed Walls soshapedand positioned as'to close theopen ends'of 'theiholdvvvlien theflatteris Aunder theplunger butto loe clear of said *ends When the inold isvsidestepped,A an ejector, ineans to 4'move said ejector :ina directiontransverse to the sideways :movement of the n'iold into andoutothe spaceoccupied by -tlre thron'gh- Way-of the trough 'Wh-en the niold Ais inthe side-'stepped position, and lrn'eans located beneath the iinold'andoperative to iin-part a rapid reciprocating irnovenient to thebottonipart'oifthe l`rno'ld 'Wlien the latter is under the plunger. 'Y

lll. In `Vrnol'di'ng 'apparatus of the 'typ-'e specified thecombin'ati'onwith a plurality of pressureiplnngersof a. :plurality ofpairs of trough-shaped niolds arranged l in Vline with thfesanie numberoi' n-iold-pairs as there are plungers,.aneans to Ymove said 4moldsside# Ways afs "a `'single =unit"so fais'fto bring'al'ternate'nroldsof-"each pair under 'a' pressureplungr fas the companion rnolds aresidestep'red therefrom, 'fixed Walls'so "shapedfand positioned as lto"close 'the open ends of the nfio'ld's vWhich are under thepressure-plungers i buttolo'efclear-O 4tli'e endsfof the A'companioninolds, ifa. Y'fpl'u'ralifty 'dii' ejectors corresponding the'inolds andmeans -to inove saidejectors as a single unit ina direction Ltransverseto the path ,offthjeniolds iinto and out ofthe spaces Vwhich Will 'in-turn'be occupied 'by the thr'oug'l-lvsrays ici the side-stepped molds.-Inniolding apparatus Y of the Atype speoiied 'the combination with a`pressureplunger offtwo troufglrshaped inolds movable sideWay-'sas aVsiitgfle unit to loringeach mold natur-n ander said plunger asthecompanion mold fis side-stepped therefronna verticallyni'ovable bottonipallet lfor eajeli inold, 'fixed Walls so :shaped and vposition'e'dv'as'to fclose the open endsovth'e lnol'dwhifeh is under the plungerfbuttofbe clear -o-the ends of the coinpani'on A'rnoloh' Vtvvo ejeetors-ni'ov'alole fas a si-nfgleiniitVU 1in' -a 'direction transverse to vthepath of the molds, into ando'ut' o'f the spaces which v.will in 'turn heOccupied by the thronghway kof the yside'estepp'ed' inOld, mechanismlocated hel'ow'tlre inolds lio-r :irnparting a rapid reeiprocatoryinove'rnent to the bottoni pallet of the lrnold under the plunger, aVcontinuon-slyruniiing "driving ni'ernberand L-ineans operated'froinisaid jcontinuouslyerunning fineinhe'r to effect instep the.periodic r'ise and fall of the-'pressri-replunger, itliethrowing inand'out of oper-ation foi 'the reciprocating -ineohfanisin ffor :thein'oldf-"bottoins, the side-stepping of theniolds and @the advance andWithdrawal Eof the ejectorfunit. Y

in testimony whereof I aiiix my signature.

JOHN STANLEY nnnnisoiv.:

